severy



(No Model.)

M. L. SEVERY.

STEAM BOILER.

Patented Apr. 18, 1893.

THE NOR ms PETERS (n, Pnmumu, wAsmNGmN. n. c.

UNITED STATES PATENT OFFICE.

MELVIN L. SEVERY, OF BOSTON, MASSACHUSETTS, ASSIGNOR TO FRANCIS DOANE,CHARLES F. CROWELL, AND MELVIN L. SEVERY, TRUSTEES,

OF SAME PLACE.

STEAM-BOILER.

SPECIFICATION forming part of Letters Patent No. 495,524, dated April18, 1893.

Application filed November 10, 1892. Serial No. 451655. (No model.)

To all whom it may concern.-

Be it known that I, MELVIN L. SEVERY, a citizen of the United States,residing at Boston,in the county of Suffolk and State of Mas sachusetts,have invented certain new and useful Improvements in Steam-Boilers, ofwhich the following, taken in connection with the accompanying drawings,is a specification.

In an application for Letters Patent of the United States for animprovement in apparatus for'the utilization of solar heat, filedsimultaneously with this, I have described and shown a horizontalcylindrical steam boiler supported in the focus of a reflector, whichreflector is given a movement angularly to the plane of the horizon inorder that, in accordance with the apparent movement of the sun, theaxis of the reflector may be constantly maintained parallel to the solarrays. It is obvious that, as the reflector moves from a nearlyhorizontal to a vertical position in following the apparent movement ofthe sun, the level of the water in the boiler relative to such boilerwill constantly vary until the end of the pipe which opens into thespace above the water in the boiler when the reflector is in ahorizontal position will be car- 'ried below the surfaceof the .water inthe boiler, and the passage of steam through the pipe to the steam chestwill be thereby prevented.

The object of the first part of this invention is to provide meanswhereby communication between the steam chest and the space above thewater in the boiler may be always maintained, notwithstanding thesechanges in the level of the water; and to this end the first part of myinvention consists in the arrangement, substantially as hereinafter morefully set forth, of a series of pipes forming a communication betweenthe steam chest and the steam space in the boiler.

The second part of my invention consists in the arrangement, ashereinafter more fully set forth, of a steam chest within the boiler.

The third part of my invention relates to a device for indicating thelevel of the water in the boiler as hereinafter more fully set forth;

In the accompanying drawings, Figure 1 is In the several figures, thesame numerals refer to the same parts.

As described in an application for Letters Patent of the United Statesfiled by me June 29, 1892, Serial No. 438,421, the boiler is surroundedby a covering of glass or any other material transparent to solar raysbut opaque to the invisible dark heat rays radiated from the surface ofthe boiler, which covering is separated from the boiler by an air space.This construction is claimed in the before mentioned application, andis, therefore, not claimed in this application.

Referring to the drawings, 4 is the cylindrical steam boiler; 3 is thecovering for the same, of glass or of any other material which istransparent to the solar rays but opaque to the invisible dark heat raysradiated from the boiler.

1 and 2 are the plates which form the ends of the cylindrical boiler andcovering cylinder.

12 is a hollow cylinder arranged within the cylindrical boilerconcentrically to the same and secured in any suitable manner, as bymeans of the bolt 13; this forms the steam chest, and communicates withthe steam cylinder by a pipe 10, which is covered with a non-conductingmaterial from the point where it emerges from the covering 3. The waterin the boiler should be normally maintained at such a height that itwill just cover this steam chest, as shown in Figs. 3 and 4.

5, 6 and 7 are a series of pipes which form communication between thesteam space in the boiler and the steam chest, and extend through theair space between the covering 3 and the boiler 4, so that they areenveloped by this covering. The points of entrance of these pipes intothe boiler are arranged so,

that the opening of the pipe 5 into the boiler s about ninety degreesdistant from the openmg of the pipe 6 and the opening of the pipe 7 isat a point about midway between the openings of the pipes 5 and 6. Itwill be seen from Figs. 3 and 4 that by this arrangement as the boilerrotates on its longitudinal axis, as before stated, communicationbetween the steam in the boiler and the steam chest is alwaysmaintained, notwithstanding the changesin the level of the waterrelative to the pipes, for the reason that when the opening of the pipe6 is below the level of the water, as shown in Fig. 3, the openings ofthe pipes 5 and 7 are above the level of the water, as shown in Fig. 3,but that when the opening of the pipe 5 is below the level of the water,the openings of the pipes 6 and 7 are above the level of the water, asshown in Fig. 4. Other pipes opening into the steam space in the boilerbetween the openings of the pipes 5 and 6 may be provided, but one pipe7 will generally be found sufficient, as with this arrangement therewill sometimes be three pipes opening into the steam space, and alwaystwo.

By placing the steam chest within the boiler, I obtain economy in theutilization of the heat applied to the boiler, for the reason that noheat is wasted by radiation from the steam chest, and there is a lessbulk of water to be heated in the boiler relative to the exposedsurface, than if the steam chest were arranged in the usual manner.

The arrangement of pipes described is not provided with two or moresteam eduction pipes each leading from points on the interior of theboiler varying angularly with respect to its axis of rotation wherebyone or more of said pipes may be cut 0E or submerged on rotation of theboiler without intercepting the remainder of the pipes, substantially asset forth.

2. Asteam boiler provided with two or more steam eduction pipes each ofwhich is located at points varying angularly with respect to ahorizontal axis of the boiler, and a steam chest contained within theboiler, the said pipes communicating with the steam chest, substantiallyas described.

3. The combination, substantially as and for the purpose set forth, witha horizontal cylindrical steam boiler, of a cylindrical steam chestarranged within the steam boiler concentrically thereto, of a pipeforming a communication between the steam chest and the steam space inthe boiler and extending from the surface of said boiler, another pipealso extending from the surface of the boiler and forming acommunication between the steam chest and the steam space in the boiler,the said pipe opening into the boiler about ninety degrees from theopening into the boiler of the first named pipe, and one or more otherpipes extending from the surface of the boiler and forming acommunication between the steam chest andthe steam space in the boilermidway between the first named pipes.

4. A horizontally rotatable steam boiler, a steam chest, and a curvedtransparent tube for indicating the amount of water in the boilerarranged transversely to and having the center of its curvesubstantially co-incident with the axis of rotation of the boiler,substantially as shown and described.

In testimony whereof I have hereunto subscribed my name this 7th day ofNovember, A. D. 1892.

MELVIN L. SEVERY.

Witnesses:

D. W. ALLEN, CHAS. A. KELLOGG.

